Merge pull request #22429 from Huang-Wei/postfilter-doc

Document the changes of scheduler PostFilter extension point
2020-07-14 13:21:22 -07:00
parent b7471e9c0e 9959ffc513
commit 6ec8665bba
4 changed files with 11 additions and 51 deletions
@@ -75,6 +75,14 @@ node, the scheduler will call filter plugins in their configured order. If any
 filter plugin marks the node as infeasible, the remaining plugins will not be
 called for that node. Nodes may be evaluated concurrently.

+### PostFilter {#post-filter}
+
+These plugins are called after Filter phase, but only when no feasible nodes
+were found for the node. Plugins are called in their configured order. If
+any postFilter plugin marks the node as `Schedulable`, the remaining plugins
+will not be called. A typical PostFilter implementation is preemption, which
+tries to make the pod schedulable by preempting other Pods.
+
 ### PreScore {#pre-score}

 These plugins are used to perform "pre-scoring" work, which generates a sharable